Wada, who is rehabbing from Tommy John surgery, last threw from a mound during a rehab assignment at Triple-A Norfolk on April 19. He lasted just 2 2/3 innings that day, allowing six runs on six hits and walking four.

"I haven't thrown in a long time on the mound, so I was actually very happy and it was very fun,” Wada said through translator Seob Yoon. “I have been throwing on the half-mound, so it didn't feel awkward. It wasn't much of a difference, but it was very fun."

Asked if he would throw again from a half mound, Wada quickly answered in English, “Maybe.”

It’s a significant step for Wada, who has spent his entire career as an Oriole dealing with shoulder issues. He signed a two-year, $8.15 million contract last offseason and a club option for 2015. His big league career is limited to a five spring training innings last year.

"I saw him 10 days ago, just on flat ground, and the ball was coming out good, and it's coming out much better,” Orioles pitching coach Rick Adair said. “He's done a lot of work.[Rehab coordinator] Chris Correnti has done a tremendous job physically getting him back in shape and staying on this program. It was the first day and it was real good. Obviously, anytime you've got an injury, that first day is exciting. He probably had a little bit of adrenaline going and he's doing good.”

In other news:

-- The team will hold a simulated game on the back fields of the Ed Smith Stadium complex on Tuesday morning beginning at 10:15. It will be an opportunity for pitchers who haven’t thrown or aren’t scheduled to throw that day to gain innings. Miguel Gonzalez, Jason Hammel, Wei-Yin Chen, Darren O’Day and Jim Johnson are slated to throw their first spring innings.

-- Chris Tillman, slated to start Tuesday’s game against the Pittsburgh Pirates in Bradenton, is scheduled to be followed by right-hander Todd Redmond, right-hander Steve Johnson and right-hander Dylan Bundy.

-- Right-hander Jake Arrieta is scheduled to start the Orioles’ afternoon split squad game Wednesday against the Yankees in Tampa, while left-hander Zach Britton will start the night game against the Boston Red Sox at Ed Smith Stadium.

Nolan Reimold hadn't yet faced an opposing pitcher in 10 months heading into Sunday's Grapefruit League game against the Toronto Blue Jays. But Orioles manager Buck Showalter had already noticed the progress Reimold made this spring after season-ending neck surgery last year.